Programmable FemtoClock® NG LVPECL/LVDS
Clock Generator with 8-Outputs
IDT8T49N008I
DATASHEET
General Description
Features
The IDT8T49N008I is an eight output Clock Synthesizer with
selectable LVDS or LVPECL outputs. The IDT8T49N008I can
synthesize any one of four frequencies from a single crystal or
reference clock. The four frequencies are selected from the
Frequency Selection Table (Table 3A) and are programmed via I2C
interface. The four predefined frequencies are selected in the user
application by two frequency selection pins. Note the desired
programmed frequencies must be used with the corresponding
crystal or clock frequency as indicated in Table 3A.
•
•
•
Fourth Generation FemtoClock NG PLL technology
•
•
FemtoClock NG VCO Range: 1.91GHz - 2.5GHz
•
•
•
•
RMS phase jitter at 156.25MHz (10kHz - 1MHz): 175fs (typical)
•
•
-40°C to 85°C ambient operating temperature
Excellent phase noise performance is maintained with IDT’s Fourth
Generation FemtoClock® NG PLL technology, which delivers
sub-400fs RMS phase jitter.
Eight selectable LVPECL or LVDS outputs
CLK, nCLK input pair can accept the following differential input
levels: LVPECL, LVDS, HCSL
RMS phase jitter at 156.25MHz (12kHz - 20MHz):
228fs (typical)
Full 2.5V or 3.3V power supply
I2C programming interface
PCI Express (2.5 Gb/S), Gen 2 (5 Gb/s) and Gen 3 (8 Gb/s) jitter
compliant
Lead-free (RoHS 6) packaging
Q4
nQ4
Q5
nQ5
VCCO
Q6
nQ6
Q7
nQ7
VEE
Pin Assignment
30 29 28 27 26 25 24 23 22 21
VEE
SCLK
SDATA
VEE
VCCA
LOCK
VEE
VCC
CLK_SEL
VEE
31
20
32
19
33
18
34
17
35
16
36
15
37
14
38
13
39
12
40
11
2
3
4
5
6
7
8
9 10
Q0
nQ0
Q1
nQ1
VCCO
Q2
nQ2
Q3
nQ3
VEE
1
FSEL1
VCC
VEE
ADDR_SEL
FSEL0
nCLK
CLK
VEE
XTAL_OUT
XTAL_IN
IDT8T49N008I
40-Lead VFQFN
6mm x 6mm x 0.925mm package body
4.65mm x 4.65mm E-Pad
NL Package
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
1
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Block Diagram
LOCK
Q0
nQ0
Q1
nQ1
CLK SEL
Q2
Pulldown
nQ2
Q3
XTAL_IN
1
Xtal
Osc
CLK
nCLK
PS
Pulldown
PU/PD
nQ3
0
XTAL_OUT
÷P[1:0]
1
Phase
Detector
+
Charge
Pump
÷N[6:0]
FemtoClock®NG
VCO
Q4
0
nQ4
Q5
nQ5
÷M [8:1]
Q6
nQ6
Q7
VPP/FSEL 0
G_CLK/FSEL 1
SCLK
SDATA
ADDR_SEL
nQ7
Pulldown
Divider,
Pulldown Output Type
Pullup
&
Output
Pullup
Enable
Pulldown
Selection
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
8
OUTPUT ENABLE
8
OUTPUT STYLE
2
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Pin Description and Pin Characteristic Tables
Table 1. Pin Descriptions
Number
Name
1, 2
Q0, nQ0
Output
Type
Differential output pair. LVPECL or LVDS interface levels.
Description
3, 4
Q1, nQ1
Output
Differential output pair. LVPECL or LVDS interface levels.
5, 26
VCCO
Power
Output supply pins.
6, 7
Q2, nQ2
Output
Differential output pair. LVPECL or LVDS interface levels.
8, 9
Q3, nQ3
Output
Differential output pair. LVPECL or LVDS interface levels.
10, 13, 18,
21, 31, 34,
37, 40
VEE
Power
Negative supply pins.
11,
12
XTAL_IN
XTAL_OUT
Input
Crystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output.
Crystal frequency is selected from Table 3A.
14
CLK
Input
Pulldown
Non-inverting differential clock input.
15
nCLK
Input
Pullup/
Pulldown
Inverting differential clock input. Internal resistor bias to VCC/2.
16,
20
FSEL0,
FSEL1
Input
Pulldown
Frequency and configuration. Selects between one of four factory
programmable power-up default configurations. The four configurations can
have different PLL states, output frequencies, output styles and output states.
These default configurations can be overwritten after power-up via I2C.
LVCMOS/LVTTL interface levels.
00 = Configuration 0 (default)
01 = Configuration 1
10 = Configuration 2
11 = Configuration 3
17
ADDR_SEL
Input
Pulldown
I2C Address select pin. LVCMOS/LVTTL interface levels.
19, 38
VCC
Power
Core supply pins.
22, 23
nQ7, Q7
Output
Differential output pair. LVPECL or LVDS interface levels.
24, 25
nQ6, Q6
Output
Differential output pair. LVPECL or LVDS interface levels.
27, 28
nQ5, Q5
Output
Differential output pair. LVPECL or LVDS interface levels.
29, 30
nQ4, Q4
Output
32
SCLK
Input
Pullup
I2C Clock Input. LVCMOS/LVTTL interface levels.
33
SDATA
Input/Output
Pullup
I2C Data Input. Input: LVCMOS/LVTTL interface levels. Output: Open Drain.
35
VCCA
Power
36
LOCK
Output
39
CLK_SEL
Input
Differential output pair. LVPECL or LVDS interface levels.
Analog supply pin.
PLL Lock Indicator. LVCMOS/LVTTL interface levels.
Pulldown
Input source control pin. LVCMOS/LVTTL interface levels.
0 = XTAL (default)
1 = CLK, nCLK
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
Table 2. Pin Characteristics
Symbol
Parameter
CIN
Input Capacitance
3.5
pF
RPULLDOWN
Input Pulldown Resistor
51
k
RPULLUP
Input Pullup Resistor
51
k
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
Test Conditions
3
Minimum
Typical
Maximum
Units
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Frequency Configuration
Table 3A. Frequency Configuration Examples
Output Frequencies
(MHz)
30.72
61.44
62.5
76.8
78.125
100
106.25
122.8
125
133.33
148.5
150
153.6
155.52
156.25
159.375
160
166.66
184.32
187.5
200
212.5
250
300
311.04
312.5
318.75
322.265625
375
400
425
491.52
614.4
622.08
625
1228.88
Input Frequency or
Crystal Frequency
(MHz)
30.72
30.72
25
30.72
25
25
26.5625
30.72
25
25
27
25
30.72
19.44
25
100
125
26.5625
20
25
30.72
61.44
25
25
26.5625
25
25
19.44
77.76
155.52
25
125
156.25
26.5625
25.78125
25
25
26.5625
30.72
30.72
122.88
153.6
19.44
25
30.72
Input Clock
Divider
P
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
5
1
1
1
1
1
1
1
1
1
1
1
1
2
1
2
5
1
2
1
1
1
1
1
2
5
1
1
1
Input Clock
Prescaler
PS
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x1
x2
x2
x2
x2
x2
x1
x1
x2
x2
x2
x2
x2
x1
x1
x2
x1
x2
x2
x1
x1
x2
x2
x2
x2
x1
x2
x2
x2
x2
Feedback
Divider
M
32
32
40
40
50
40
40
32
40
48
44
42
40
64
50
50
50
36
48
40
36
36
90
40
40
40
48
64
32
32
50
40
40
36
150
90
40
40
32
40
40
40
64
50
40
Output
Divider
N
64
32
32
32
32
20
20
16
16
18
16
14
16
16
16
16
16
12
12
12
12
12
12
10
10
8
8
8
8
8
8
8
8
6
6
6
5
5
4
4
4
4
4
4
2
VCO
Frequency
(MHz)
1966.08
1966.08
2000
2457.6
2500
2000
2125
1966.08
2000
2400
2376
2100
2457.6
2488.32
2500
2500
2500
1912.5
1920
2000
2211.84
2211.84
2250
2000
2125
2000
2400
2488.32
2488.32
2488.32
2500
2500
2500
1912.5
1933.59375
2250
2000
2125
1966.08
2457.6
2457.6
2457.6
2488.32
2500
2457.6
NOTE: Each device supports 4 output frequencies (with related input or crystal value) as selected from this table Register Settings.
NOTE: XTAL operation: fOUT = fREF * PS * M / N; CLK, nCLK input operation: fOUT = (fREF / P) * PS * M / N.
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
4
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Table 3B. I2C Register Map
Register
Binary
Register
Address
Register Bit
D7
D6
D5
D4
D3
D2
D1
D0
0
00000
M0[8]
M0[7]
M0[6]
M0[5]
M0[4]
M0[3]
M0[2]
M0[1]
1
00001
M1[8]
M1[7]
M1[6]
M1[5]
M1[4]
M1[3]
M1[2]
M1[1]
2
00010
M2[8]
M2[7]
M2[6]
M2[5]
M2[4]
M2[3]
M2[2]
M2[1]
3
00011
M3[8]
M3[7]
M3[6]
M3[5]
M3[4]
M3[3]
M3[2]
M3[1]
4
00100
unused
N0[6]
N0[5]
N0[4]
N0[3]
N0[2]
N0[1]
N0[0]
5
00101
unused
N1[6]
N1[5]
N1[4]
N1[3]
N1[2]
N1[1]
N1[0]
6
00110
unused
N2[6]
N2[5]
N2[4]
N2[3]
N2[2]
N2[1]
N2[0]
7
00111
unused
N3[6]
N3[5]
N3[4]
N3[3]
N3[2]
N3[1]
N3[0]
8
01000
unused
BYPASS0
PS0[1]
PS0[0]
P0[1]
P0[0]
CP0[1]
CP0[0]
9
01001
unused
BYPASS1
PS1[1]
PS1[0]
P1[1]
P1[0]
CP1[1]
CP1[0]
10
01010
unused
BYPASS2
PS2[1]
PS2[0]
P2[1]
P2[0]
CP2[1]
CP2[0]
11
01011
unused
BYPASS3
PS3[1]
PS3[0]
P3[1]
P3[0]
CP3[1]
CP3[0]
12
01100
LVDS_
SEL0[Q7]
LVDS_
SEL0[Q6]
LVDS_
SEL0[Q5]
LVDS_
SEL0[Q4]
LVDS_
SEL0[Q3]
LVDS_
SEL0[Q2]
LVDS_
SEL0[Q1]
LVDS_
SEL0[Q0]
13
01101
LVDS_
SEL1[Q7]
LVDS_
SEL1[Q6]
LVDS_
SEL1[Q5]
LVDS_
SEL1[Q4]
LVDS_
SEL1[Q3]
LVDS_
SEL1[Q2]
LVDS_
SEL1[Q1]
LVDS_
SEL1[Q0]
14
01110
LVDS_
SEL2[Q7]
LVDS_
SEL2[Q6]
LVDS_
SEL2[Q5]
LVDS_
SEL2[Q4]
LVDS_
SEL2[Q3]
LVDS_
SEL2[Q2]
LVDS_
SEL2[Q1]
LVDS_
SEL2[Q0]
15
01111
LVDS_
SEL3[Q7]
LVDS_
SEL3[Q6]
LVDS_
SEL3[Q5]
LVDS_
SEL3[Q4]
LVDS_
SEL3[Q3]
LVDS_
SEL3[Q2]
LVDS_
SEL3[Q1]
LVDS_
SEL3[Q0]
16
10000
OE0[Q7]
OE0[Q6]
OE0[Q5]
OE0[Q4]
OE0[Q3]
OE0[Q2]
OE0[Q1]
OE0[Q0]
17
10001
OE1[Q7]
OE1[Q6]
OE1[Q5]
OE1[Q4]
OE1[Q3]
OE1[Q2]
OE1[Q1]
OE1[Q0]
18
10010
OE2[Q7]
OE2[Q6]
OE2[Q5]
OE2[Q4]
OE2[Q3]
OE2[Q2]
OE2[Q1]
OE2[Q0]
19
10011
OE3[Q7]
OE3[Q6]
OE3[Q5]
OE3[Q4]
OE3[Q3]
OE3[Q2]
OE3[Q1]
OE3[Q0]
20
10100
reserved
reserved
reserved
reserved
reserved
reserved
unused
unused
21
10101
unused
unused
unused
unused
unused
unused
unused
unused
22
10110
unused
unused
unused
unused
unused
unused
unused
unused
23
10111
unused
unused
unused
unused
unused
unused
unused
unused
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
5
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Table 3C. I2C Function Descriptions
Bits
Name
Pn[1:0]
Input Clock Divider Register n
(n = 0...3)
Sets the PLL input clock divider. The divider value has the range of 1, 2,
4 and 5. See Table 3F. Pn[1:0] bits are programmed with values to
support default configuration settings for FSEL[1:0].
PSn(1:0)
Input Prescaler Register n
(n = 0...3)
Sets the PLL input clock prescaler value. Valid prescaler values are x0.5,
x1 or x2. See Table 3F. Set prescaler to x2 for optimum phase noise
performance. PSn[1:0] bits are programmed with values to support
default configuration settings for FSEL[1:0].
Mn[8:1]
Integer Feedback Divider
Register n
(n = 0...3)
Sets the integer feedback divider value. Based on the FemtoClock NG
VCO range, the applicable feedback dividers settings are 16 thru 250.
Please note the register value presents bits [8:1] of Mn, the LSB of Mn is
not in the register. Mn[8:1] bits are programmed with values to support
default configuration settings for FSEL[1:0].
Nn[6:0]
Output Divider Register n
(n = 0...3)
Sets the output divider. The output divider value can range from 2, 3, 4,
5, 6 and 8, 10, 12 to 126 (step: 2). See Table 3G for the output divider
coding. Nn[6:0] bits are programmed with values to support default
configuration settings for FSEL[1:0].
CPn[1:0]
PLL Bandwidth Register n
(n = 0...3)
Sets the FemtoClock NG PLL bandwidth by controlling the charge pump
current. See Table 3H. CPn[1:0] bits are programmed with values to
support default configuration settings for FSEL[1:0].
PLL Bypass Register n
(n = 0...3)
Bypasses PLL. Output of the prescaler is routed through the output
divider N to the output fanout buffer. Programming a 1 to this bit
bypasses the PLL. Programming a 0 to this bit routes the output of the
prescaler through the PLL. BYPASSn bits are programmed with values
to support default configuration settings for FSEL[1:0].
BYPASSn
OEn[Q0]
OEn[Q1]
OEn[Q2]
OEn[Q3]
OEn[Q4]
OEn[Q5]
OEn[Q6]
OEn[Q7]
LVDS_SELn[Q0]
LVDS_SELn[Q1]
LVDS_SELn[Q2]
LVDS_SELn[Q3]
LVDS_SELn[Q4]
LVDS_SELn[Q5]
LVDS_SELn[Q6]
LVDS_SELn[Q7]
Output Enable Register n
(n = 0...3)
Output Style Register n
(n = 0...3)
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
Function
Sets the outputs to Active or High Impedance. Programming a 0 to this
bit sets the outputs to High Impedance. Programming a 1 sets the
outputs to active status. OEn[Q0], OEn[Q1], OEn[Q2], OEn[Q3],
OEn[Q4], OEn[Q5], OEn[Q6], OEn[Q7] bits are programmed with values
to support default configuration settings for FSEL[1:0].
Sets the differential output style to either LVDS or LVPECL interface
levels. Programming a 1 to this bit sets the output styles to LVDS levels.
Programming a 0 to this bit sets the output styles to LVPECL levels.
LVDS_SELn[Q0], LVDS_SELn[Q1], LVDS_SELn[Q2], LVDS_SELn[Q3]
LVDS_SELn[Q4], LVDS_SELn[Q5], LVDS_SELn[Q6], LVDS_SELn[Q7]
bits are programmed with values to support default configuration settings
for FSEL[1:0].
6
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Table 3D. Feedback Divider Mn Coding
Register Bit
Mn[8:1]
Feedback Divider Mn
Do Not Use
1 thru 15
00001000
16
00001001
18
00001010
20
00001011
22
00001100 thru 00011111
24 thru 62
00100000
64
00100001
66
00100010
68
00100011
70
00100100
72
...
Mn
00110010
100
00110011
102
00110100
104
00110101
106
...
Mn
01111010
244
01111011
246
01111100
248
01111101
250
Note: Mn is always an even value. The Mn[0] bits are not implemented.
Table 3E. PLL Pre-Scaler P Coding
CLK_SEL
0
Input
XTAL
P[1:0]
xx
00
01
1
PS[1:0]
Input Clock
Divider
P
Input Clock
Prescaler
PS
Input Frequency (MHz)
Minimum
Maximum
00
1
x1
10
40
01
1
x0.5
20
40
1x
1
x2
5
40
00
1
x1
10
120
01
1
x0.5
20
240
1x
1
x2
5
60
00
2
x1
20
240
01
2
x0.5
40
480
1x
2
x2
10
120
00
4
x1
40
480
01
4
x0.5
80
800
1x
4
x2
20
240
00
5
x1
50
600
01
5
x0.5
100
800
1x
5
x2
25
300
CLK
10
11
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
7
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Table 3F. PLL Post Divider N Coding
Register Bit
Output Frequency Range
Nn[6:0]
Output Divider
N
000000X
2
0000010
2
955
1250
0000011
3
636.67
833.33
0000100
4
477.5
625
0000101
5
382
500
000011X
6
318.33
416.67
000100X
8
238.75
312.5
000101X
10
191
250
000110X
12
159.1667
208.33
000111X
14
136.4286
178.57
001000X
16
119.375
156.25
...
N (even integer)
(1910 ÷ N)
(2500 ÷ N)
111101X
124
15.40
20.16
111111X
126
15.16
19.84
fOUT_MIN (MHz)
fOUT_MAX (MHz)
Do Not Use
NOTE: X denotes “don’t care”.
Table 3G. FemtoClock NG PLL Bandwidth Coding
Register Bit
Feedback Divider Value Range
CPn1
CPn0
Minimum
Maximum
0
0
16
48
0
1
48
100
1
0
100
250
1
1
192
250
NOTE: FemtoClock NG PLL stability is only guaranteed over the feedback divider ranges listed is Table 3G.
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
8
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Power-up Default Configuration Description
The IDT8T49N008I supports a variety of options such as different
output styles, number of programmed default frequencies, output enable and operating temperature range. The device options and default frequencies must be specified at the time of order and are
programmed by IDT prior to shipment. The document, Programmable FemtoClock® NG Product Ordering Guide specifies the available
order codes, including the device options and default frequency configurations. Example part number: 8T49N004A-007NLGI, specifies a
quad frequency clock generator with default frequencies of
106.25MHz, 133.333MHz, 156.25MHz and 156.25MHz, with four
LVDS outputs that are enabled after power-up, specified over the industrial temperature range and housed in a lead-free (6/6 RoHS)
VFQFN package.
Other order codes with respective programmed frequencies are
available from IDT upon request. After power-up changes to the
output frequencies are controlled by FSEL[1:0] or the I2C interface.
Changes to the output styles and states of outputs (enabled or
disabled) can also be controlled with the I2C interface after power up.
Table 3H. Power-up Default Settings
FSEL1
FSEL0
Frequency
PLL State
(On or Bypass)
Output State
(Active or High Impedance)
Output Style
(LVDS or LVPECL)
0 (default)
0 (default)
Frequency 0
PLL State 0
Output State 0
Output Style 0
0
1
Frequency 1
PLL State 1
Output State 1
Output Style 1
1
0
Frequency 2
PLL State 2
Output State 2
Output Style 2
1
1
Frequency 3
PLL State 3
Output State 3
Output Style 3
Serial Interface Configuration Description
The IDT8T49N008I has an I2C-compatible configuration interface to
access any of the internal registers (Table 3B) for frequency and PLL
parameter programming. The IDT849N008I acts as a slave device on
the I2C bus and has the address 0b110111x, where x is set by the
value on the ADDR_SEL input (see Tables 3I and 3J). The interface
accepts byte-oriented block write and block read operations. An
address byte (P) specifies the register address (Table 3B) as the byte
position of the first register to write or read. Data bytes (registers) are
accessed in sequential order from the lowest to the highest byte
(most significant bit first, see Table 3K, 3L). Read and write block
transfers can be stopped after any complete byte transfer. It is
recommended to terminate the I2C read or write transfer after
accessing byte #23 by sending a stop command.
For full electrical I2C compliance, it is recommended to use external
pull-up resistors for SDATA and SCLK. The internal pull-up resistors
have a size of 50k typical.
Table 3I. I2C Device Slave Address ADDR_SEL = 0 (default)
1
1
0
1
1
1
0
R/W
Table 3J. I2C Device Slave Address ADDR_SEL = 1
1
1
0
1
1
1
1
R/W
Table 3K. Block Write Operation
Bit
Description
1
2:8
9
10
11:18
19
20:27
28
29-36
37
...
...
...
START
Slave Address
W (0)
ACK
Address Byte P
ACK
Data Byte
(P)
ACK
Data Byte
(P+1)
ACK
Data Byte
...
ACK
STOP
1
7
1
1
8
1
8
1
8
1
8
1
1
Length (bits)
Table 3L. Block Read Operation
Bit
1
2:8
9
10
11:18
19
20
21:27
28
29
30:37
38
39-46
47
...
...
...
START
Slave
Address
W
(0)
A
C
K
Address
byte P
A
C
K
Repeated
START
Slave
address
R
(1)
A
C
K
Data Byte
(P)
A
C
K
Data Byte
(P+1)
A
C
K
Data Byte
...
A
C
K
STOP
1
7
1
1
8
1
1
7
1
1
8
1
8
1
8
1
1
Description
Length (bits)
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
9
©2014 Integrated Device Technology, Inc.
IDT8T49N008I Data Sheet
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
Absolute Maximum Ratings
NOTE: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress
specifications only. Functional operation of product at these conditions or any conditions beyond those listed in the DC Characteristics or AC
Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.
Item
Rating
Supply Voltage, VCC
3.63V
Inputs, VI
XTAL_IN
Other Input
0V to 2V
-0.5V to VCC + 0.5V
Outputs, IO (LVPECL)
Continuous Current
Surge Current
50mA
100mA
Outputs, IO (SDATA)
10mA
Outputs, IO (LVDS)
Continuous Current
Surge Current
10mA
15mA
Package Thermal Impedance, JA
32.4C/W (0 mps)
Storage Temperature, TSTG
-65C to 150C
DC Electrical Characteristics
Table 4A. Power Supply DC Characteristics, VCC = VCCO = 3.3V ± 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
Parameter
VCC
Core Supply Voltage
VCCA
Test Conditions
Minimum
Typical
Maximum
Units
3.135
3.3
3.465
V
Analog Supply Voltage
VCC – 0.32
3.3
VCC
V
VCCO
Output Supply Voltage
3.135
3.3
3.465
V
ICCA
Analog Supply Current
32
mA
IEE
Power Supply Current
LVPECL
225
mA
ICC
Power Supply Current
LVDS
125
mA
ICCO
Output Supply Current
LVDS
162
mA
Table 4B. Power Supply DC Characteristics, VCC = VCCO = 2.5V ± 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
Parameter
VCC
Core Supply Voltage
VCCA
Minimum
Typical
Maximum
Units
2.375
2.5
2.625
V
Analog Supply Voltage
VCC – 0.28
2.5
VCC
V
VCCO
Output Supply Voltage
2.375
2.5
2.625
V
ICCA
Analog Supply Current
28
mA
IEE
Power Supply Current
LVPECL
216
mA
ICC
Power Supply Current
LVDS
122
mA
ICCO
Output Supply Current
LVDS
160
mA
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
Test Conditions
10
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Table 4C. LVCMOS/LVTTL DC Characteristics, VCC = VCCO = 3.3V ± 5% or 2.5V ± 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
Parameter
VIH
Input High
Voltage
VIL
Input Low
Voltage
Maximum
Units
IIH
IIL
Input
Low Current
VOH
Output High
Voltage;
NOTE 1
VOL
Output Low
Voltage;
NOTE 1
Minimum
VCC = 3.3V
2
VCC + 0.3
V
VCC = 2.5V
1.7
VCC + 0.3
V
VCC = 3.3V
-0.3
0.8
V
VCC = 2.5V
-0.3
0.7
V
VCC = 3.3V or 2.5V
0.5
V
SCLK, SDATA
VCC = VIN = 3.465V or 2.625V
5
µA
FSEL[1:0],
CLK_SEL,
ADDR_SEL
VCC = VIN = 3.465V or 2.625V
150
µA
SCLK, SDATA,
FSEL[1:0],
CLK_SEL,
ADDR_SEL
SCLK, SDATA,
CLK_SEL,
ADDR_SEL
FSEL[1:0],
Input
High Current
Test Conditions
Typical
SCLK, SDATA
VCC = 3.465V or 2.625V,
VIN = 0V
-150
µA
FSEL[1:0],
CLK_SEL,
ADDR_SEL
VCC = 3.465V or 2.625V,
VIN = 0V
-5
µA
LOCK
VCC = 3.465V
2.6
V
LOCK
VCC = 2.625V
1.8
V
LOCK
VCC = 3.465V or 2.625V
0.5
V
NOTE 1: Output terminated with 50 to VCCO/2. See Parameter Measurement Information, Output Load Test Circuit diagrams.
Table 4D. Differential DC Characteristics, VCC = VCCO = 3.3V ± 5% or 2.5V ± 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
Parameter
Test Conditions
IIH
Input
High Current
IIL
Input
Low Current
VPP
Peak-to-Peak Voltage
0.15
1.3
V
VCMR
Common Mode Input Voltage;
NOTE 1
VEE
VCC – 0.85
V
Maximum
Units
CLK, nCLK
Minimum
Typical
VCC = VIN = 3.465V or 2.625V
Maximum
Units
150
µA
nCLK
VCC = 3.465V or 2.625V, VIN = 0V
-150
µA
CLK
VCC = 3.465V or 2.625V, VIN = 0V
-5
µA
NOTE 1: Common mode input voltage is at the cross point.
Table 4E. LVPECL DC Characteristics, VCC = VCCO = 3.3V±5%, VEE = 0V, TA = -40°C to 85°C
Symbol
Parameter
Test Conditions
Minimum
Typical
VOH
Output High Voltage; NOTE 1
VCC – 1.1
VCCO – 0.75
V
VOL
Output Low Voltage; NOTE 1
VCC – 2.0
VCCO – 1.6
V
VSWING
Peak-to-Peak Output
Voltage Swing
0.6
1.0
V
NOTE 1: Outputs termination with 50 to VCC – 2V.
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
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©2014 Integrated Device Technology, Inc.
IDT8T49N008I Data Sheet
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
Table 4F. LVPECL DC Characteristics, VCC = VCCO = 2.5V ± 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
Parameter
VOH
Output High Voltage; NOTE 1
VOL
Output Low Voltage; NOTE 1
VSWING
Peak-to-Peak Output
Voltage Swing
Test Conditions
Minimum
Typical
Maximum
Units
VCC – 1.2
VCCO – 0.75
V
VCC – 2.0
VCC – 1.5
V
0.5
1.0
V
NOTE 1: Outputs termination with 50 to VCC – 2V.
Table 4G. LVDS DC Characteristics, VCC = VCCO = 3.3V±5%, VEE = 0V, TA = -40°C to 85°C
Symbol
Parameter
VOD
Differential Output Voltage
VOD
VOD Magnitude Change
VOS
Offset Voltage
VOS
VOS Magnitude Change
Test Conditions
Minimum
Typical
Maximum
Units
247
345
454
mV
50
mV
1.375
V
50
mV
1.15
1.25
Table 4H. LVDS DC Characteristics, VCC = VCCO = 2.5V ± 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
Parameter
VOD
Differential Output Voltage
VOD
VOD Magnitude Change
VOS
Offset Voltage
VOS
VOS Magnitude Change
Test Conditions
Minimum
Typical
Maximum
Units
230
340
454
mV
50
mV
1.375
V
50
mV
Maximum
Units
1.15
1.25
Table 5. Crystal Characteristics
Parameter
Test Conditions
Minimum
Mode of Oscillation
Typical
Fundamental
Frequency
10
40
MHz
Load Capacitance (CL)
10
18
pF
50

Equivalent Series Resistance (ESR)
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
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©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
AC Electrical Characteristics
Table 6A. PCI Express Jitter Specifications, VCC = VCCO = 3.3V ± 5% or 2.5V ± 5%, VEE = 0V, TA = -40°C to 85°C
Typical
Maximum
PCIe Industry
Specification
Units
ƒ = 100MHz, 25MHz Crystal Input
Evaluation Band: 0Hz - Nyquist
(clock frequency/2)
8.3
13.2
86
ps
tREFCLK_HF_RMS Phase Jitter RMS;
NOTE 2, 4
(PCIe Gen 2)
ƒ = 100MHz, 25MHz Crystal Input
High Band: 1.5MHz - Nyquist
(clock frequency/2)
0.78
1.35
3.1
ps
tREFCLK_LF_RMS
(PCIe Gen 2)
Phase Jitter RMS;
NOTE 2, 4
ƒ = 100MHz, 25MHz Crystal Input
Low Band: 10kHz - 1.5MHz
0.05
0.10
3.0
ps
tREFCLK_RMS
(PCIe Gen 3)
Phase Jitter RMS;
NOTE 3, 4
ƒ = 100MHz, 25MHz Crystal Input
Evaluation Band: 0Hz - Nyquist
(clock frequency/2)
0.175
0.34
0.8
ps
Symbol
Parameter
tj
(PCIe Gen 1)
Phase Jitter
Peak-to-Peak;
NOTE 1, 4
Test Conditions
Minimum
NOTE: Electrical parameters are guaranteed over the specified ambient operating temperature range, which is established when the device is
mounted in a test socket with maintained transverse airflow greater than 500 lfpm. The device will meet specifications after thermal equilibrium
has been reached under these conditions. For additional information, refer to the PCI Express Application Note section in the datasheet.
NOTE 1: Peak-to-Peak jitter after applying system transfer function for the Common Clock Architecture. Maximum limit for PCI Express Gen 1
is 86ps peak-to-peak for a sample size of 106 clock periods.
NOTE 2: RMS jitter after applying the two evaluation bands to the two transfer functions defined in the Common Clock Architecture and
reporting the worst case results for each evaluation band. Maximum limit for PCI Express Generation 2 is 3.1ps RMS for tREFCLK_HF_RMS
(High Band) and 3.0ps RMS for tREFCLK_LF_RMS (Low Band).
NOTE 3: RMS jitter after applying system transfer function for the common clock architecture. This specification is based on the PCI Express
Base Specification Revision 0.7, October 2009 and is subject to change pending the final release version of the specification.
NOTE 4: This parameter is guaranteed by characterization. Not tested in production.
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
13
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Table 6B. AC Characteristics, VCC = VCCO = 3.3V ± 5% or 2.5V ± 5% VEE = 0V, TA = -40°C to 85°C
Symbol
Parameter
Test Conditions
fDIFF_IN
Differential Input Frequency
fVCO
VCO Frequency
tjit(Ø)
RMS Phase Jitter, Random;
NOTE 1
Minimum
Typical
Maximum
Units
10
312.5
MHz
1910
2500
MHz
25MHz Crystal, fOUT = 100MHz,
Integration Range:
12kHz – 20MHz
258
332
fs
25MHz Crystal, fOUT = 125MHz,
Integration Range: 12kHz – 20MHz
220
291
fs
25MHz Crystal, fOUT = 125MHz,
Integration Range: 10kHz – 1MHz
164
232
fs
25MHz Crystal, fOUT = 156.25MHz,
Integration Range: 12kHz – 20MHz
228
306
fs
25MHz Crystal, fOUT = 156.25MHz,
Integration Range: 10kHz – 1MHz
175
234
fs
25MHz Crystal, fOUT = 250MHz,
Integration Range: 12kHz – 20MHz
212
292
fs
30.72MHz Crystal, fOUT = 491.52MHz,
Integration Range: 12kHz – 20MHz
213
299
fs
19.44MHz Crystal, fOUT = 622.08MHz,
Integration Range: 12kHz – 20MHz
280
386
fs
tsk(o)
Output Skew;
NOTE 2, 3
LVPECL Outputs
LVDS_SEL = 0
50
ps
LVDS Outputs
LVDS_SEL = 1
50
ps
tR / tF
Output
Rise/Fall Time
LVPECL Outputs
20% - 80%, LVDS_SEL = 0
100
400
ps
LVDS Outputs
20% - 80%, LVDS_SEL = 1
100
400
ps
N > 3 Output Divider;
LVDS_SEL = 0 or 1
47
53
%
N  3 Output Divider;
LVDS_SEL = 0 or 1
42
58
%
odc
Output Duty Cycle
tLOCK
PLL Lock Time;
NOTE 3, 4
LOCK Output
20
ms
tTRANSITION
Transition
Time;
NOTE 3, 4
LOCK Output
20
ms
NOTE: Electrical parameters are guaranteed over the specified ambient operating temperature range, which is established when the device is
mounted in a test socket with maintained transverse airflow greater than 500 lfpm. The device will meet specifications after thermal equilibrium
has been reached under these conditions.
NOTE 1: Refer to Phase Noise Plots.
NOTE 2: Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at the differential cross
points.
NOTE 3: These parameters are guaranteed by characterization. Not tested in production.
NOTE 4: Refer to tLOCK and tTRANSITION in Parameter Measurement Information.
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
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©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Noise Power (dBc/Hz)
Typical Phase Noise at 100MHz (3.3V)
Offset Frequency (Hz)
Noise Power (dBc/Hz)
Typical Phase Noise at 125MHz (3.3V)
Offset Frequency (Hz)
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
15
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Noise Power (dBc/Hz)
Typical Phase Noise at 156.25MHz (3.3V)
Offset Frequency (Hz)
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
16
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Parameter Measurement Information
2V
2V
2V
2V
VCC,
VCCO
VCC,
VCCO
VCCA
-1.3V ± 0.165V
VCCA
-0.5V ± 0.125V
2.5V LVPECL Output Load AC Test Circuit
3.3V LVPECL Output Load AC Test Circuit
SCOPE
3.3V ±5%
VCC,
VCCO
2.5V±5%
POWER SUPPLY
+ Float GND –
VCCA
VCC,
VCCO V
CCA
Qx
nQx
2.5V LVDS Output Load AC Test Circuit
3.3V LVDS Output Load AC Test Circuit
VCC
nCLK
CLK
VEE
RMS Phase Jitter
Differential Input Levels
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
17
©2014 Integrated Device Technology, Inc.
IDT8T49N008I Data Sheet
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
Parameter Measurement Information, continued
nQ[0:7]
nQx
Q[0:7]
Qx
nQy
Qy
Output Duty Cycle/Pulse Width/Period
Output Skew
nQ[0:7]
nQ[0:7]
80%
80%
VOD
Q[0:7]
Q[0:7]
20%
20%
tF
tR
LVPECL Output Rise/Fall Time
LVDS Output Rise/Fall Time
Offset Voltage Setup
Differential Output Voltage Setup
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
18
©2014 Integrated Device Technology, Inc.
IDT8T49N008I Data Sheet
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
Parameter Measurement Information, continued
Lock Time & Transition Time
Applications Information
Recommendations for Unused Input and Output Pins
Inputs:
Outputs:
LVCMOS Control Pins
LVPECL Outputs
All control pins have internal pullups or pulldowns; additional
resistance is not required but can be added for additional protection.
A 1k resistor can be used.
All unused LVPECL output pairs can be left floating. We recommend
that there is no trace attached. Both sides of the differential output
pair should either be left floating or terminated.
CLK/nCLK Inputs
LVDS Outputs
For applications not requiring the use of the differential input, both
CLK and nCLK can be left floating. Though not required, but for
additional protection, a 1k resistor can be tied from CLK to ground.
All unused LVDS output pairs can be either left floating or terminated
with 100 across. If they are left floating, there should be no trace
attached.
Crystal Inputs
For applications not requiring the use of the crystal oscillator input,
both XTAL_IN and XTAL_OUT can be left floating. Though not
required, but for additional protection, a 1k resistor can be tied from
XTAL_IN to ground.
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
19
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Wiring the Differential Input to Accept Single-Ended Levels
Figure 1 shows how a differential input can be wired to accept single
ended levels. The reference voltage V1 = VCC/2 is generated by the
bias resistors R1 and R2. The bypass capacitor (C1) is used to help
filter noise on the DC bias. This bias circuit should be located as close
to the input pin as possible. The ratio of R1 and R2 might need to be
adjusted to position the V1 in the center of the input voltage swing.
For example, if the input clock swing is 2.5V and VCC = 3.3V, R1 and
R2 value should be adjusted to set V1 at 1.25V. The values below are
for when both the single ended swing and VCC are at the same
voltage. This configuration requires that the sum of the output
impedance of the driver (Ro) and the series resistance (Rs) equals
the transmission line impedance. In addition, matched termination at
the input will attenuate the signal in half. This can be done in one of
two ways. First, R3 and R4 in parallel should equal the transmission
line impedance. For most 50 applications, R3 and R4 can be 100.
The values of the resistors can be increased to reduce the loading for
slower and weaker LVCMOS driver. When using single-ended
signaling, the noise rejection benefits of differential signaling are
reduced. Even though the differential input can handle full rail
LVCMOS signaling, it is recommended that the amplitude be
reduced. The datasheet specifies a lower differential amplitude,
however this only applies to differential signals. For single-ended
applications, the swing can be larger, however VIL cannot be less
than -0.3V and VIH cannot be more than VCC + 0.3V. Though some
of the recommended components might not be used, the pads
should be placed in the layout. They can be utilized for debugging
purposes. The datasheet specifications are characterized and
guaranteed by using a differential signal.
VCC
VCC
VCC
VCC
R3
100
Ro
RS
R1
1K
Zo = 50 Ohm
+
Driver
V1
Ro + Rs = Zo
R4
100
Receiv er
-
C1
0.1uF
R2
1K
Figure 1. Recommended Schematic for Wiring a Differential Input to Accept Single-ended Levels
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
20
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Overdriving the XTAL Interface
The XTAL_IN input can be overdriven by an LVCMOS driver or by one
side of a differential driver through an AC coupling capacitor. The
XTAL_OUT pin can be left floating. The amplitude of the input signal
should be between 500mV and 1.8V and the slew rate should not be
less than 0.2V/nS. For 3.3V LVCMOS inputs, the amplitude must be
reduced from full swing to at least half the swing in order to prevent
signal interference with the power rail and to reduce internal noise.
Figure 2A shows an example of the interface diagram for a high
speed 3.3V LVCMOS driver. This configuration requires that the sum
of the output impedance of the driver (Ro) and the series resistance
(Rs) equals the transmission line impedance. In addition, matched
termination at the crystal input will attenuate the signal in half. This
VCC
can be done in one of two ways. First, R1 and R2 in parallel should
equal the transmission line impedance. For most 50 applications,
R1 and R2 can be 100. This can also be accomplished by removing
R1 and changing R2 to 50. The values of the resistors can be
increased to reduce the loading for a slower and weaker LVCMOS
driver. Figure 2B shows an example of the interface diagram for an
LVPECL driver. This is a standard LVPECL termination with one side
of the driver feeding the XTAL_IN input. It is recommended that all
components in the schematics be placed in the layout. Though some
components might not be used, they can be utilized for debugging
purposes. The datasheet specifications are characterized and
guaranteed by using a quartz crystal as the input.
XTAL_OUT
R1
100
Ro
Rs
C1
Zo = 50 ohms
XTAL_IN
R2
100
Zo = Ro + Rs
.1uf
LVCMOS Driver
Figure 2A. General Diagram for LVCMOS Driver to XTAL Input Interface
XTAL_OUT
C2
Zo = 50 ohms
XTAL_IN
.1uf
Zo = 50 ohms
LVPECL Driver
R1
50
R2
50
R3
50
Figure 2B. General Diagram for LVPECL Driver to XTAL Input Interface
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
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©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
3.3V Differential Clock Input Interface
The CLK /nCLK accepts LVDS, LVPECL, HCSL and other differential
signals. Both VSWING and VOH must meet the VPP and VCMR input
requirements. Figures 3A to 3D show interface examples for the
CLK/nCLK input driven by the most common driver types. The input
interfaces suggested here are examples only. If the driver is from
another vendor, use their termination recommendation. Please
consult with the vendor of the driver component to confirm the driver
termination requirements.
3.3V
3.3V
3.3V
3.3V
3.3V
Zo = 50Ω
CLK
CLK
Zo = 50Ω
nCLK
R1
50Ω
Differential
Input
LVPECL
Differential
Input
LVPECL
nCLK
R2
50Ω
R2
50Ω
Figure 3B. CLK/nCLK Input Driven by a
3.3V LVPECL Driver
Figure 3A. CLK/nCLK Input Driven by a
3.3V LVPECL Driver
3.3V
3.3V
3.3V
3.3V
Zo = 50Ω
*R3
CLK
CLK
R1
100Ω
nCLK
HCSL
*R4
Zo = 50Ω
Differential
Input
LVDS
Receiver
Figure 3D. CLK/nCLK Input Driven by a 3.3V LVDS Driver
Figure 3C. CLK/nCLK Input Driven by a
3.3V HCSL Driver
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
nCLK
22
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
2.5V Differential Clock Input Interface
The CLK /nCLK accepts LVDS, LVPECL, HCSL and other differential
signals. Both VSWING and VOH must meet the VPP and VCMR input
requirements. Figures 4A to 4D show interface examples for the
CLK/nCLK input driven by the most common driver types. The input
interfaces suggested here are examples only. If the driver is from
another vendor, use their termination recommendation. Please
consult with the vendor of the driver component to confirm the driver
termination requirements.
2.5V
2.5V
2.5V
2.5V
2.5V
R3
250
R4
250
Zo = 50
CLK
Zo = 50
CLK
Zo = 50
nCLK
Zo = 50
nCLK
R1
62.5
R1
50
Differential
Input
LVPECL
R2
62.5
Differential
Input
LVPECL
R2
50
R3
18
Figure 4B. CLK/nCLK Input Driven by a
2.5V LVPECL Driver
Figure 4A. CLK/nCLK Input Driven by a
2.5V LVPECL Driver
2.5V
2.5V
2.5V
2.5V
*R3
33
Zo = 50
Zo = 50
CLK
CLK
R1
100
Zo = 50
nCLK
HCSL
*R4
33
R1
50
R2
50
Zo = 50
Differential
Input
LVDS
nCLK
Differential
Input
*Optional – R3 and R4 can be 0
Figure 4D. CLK/nCLK Input Driven by a 2.5V LVDS Driver
Figure 4C. CLK/nCLK Input Driven by a
2.5V HCSL Driver
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
23
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
LVDS Driver Termination
For a general LVDS interface, the recommended value for the
termination impedance (ZT) is between 90 and 132. The actual
value should be selected to match the differential impedance (Z0) of
your transmission line. A typical point-to-point LVDS design uses a
100 parallel resistor at the receiver and a 100 differential
transmission-line environment. In order to avoid any
transmission-line reflection issues, the components should be
surface mounted and must be placed as close to the receiver as
possible. IDT offers a full line of LVDS compliant devices with two
types of output structures: current source and voltage source. The
LVDS
Driver
standard termination schematic as shown in Figure 5A can be used
with either type of output structure. Figure 5B, which can also be
used with both output types, is an optional termination with center tap
capacitance to help filter common mode noise. The capacitor value
should be approximately 50pF. If using a non-standard termination, it
is recommended to contact IDT and confirm if the output structure is
current source or voltage source type. In addition, since these
outputs are LVDS compatible, the input receiver’s amplitude and
common-mode input range should be verified for compatibility with
the output.
ZO  ZT
LVDS
Receiver
ZT
Figure 5A. Standard Termination
LVDS
Driver
ZT
2 LVDS
ZT Receiver
2
ZO  ZT
C
Figure 5B. Optional Termination
Termination for 3.3V LVPECL Outputs
The clock layout topology shown below is a typical termination for
LVPECL outputs. The two different layouts mentioned are
recommended only as guidelines.
transmission lines. Matched impedance techniques should be used
to maximize operating frequency and minimize signal distortion.
Figures 6A and 6B show two different layouts which are
recommended only as guidelines. Other suitable clock layouts may
exist and it would be recommended that the board designers
simulate to guarantee compatibility across all printed circuit and clock
component process variations.
The differential outputs are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, terminating
resistors (DC current path to ground) or current sources must be
used for functionality. These outputs are designed to drive 50
R3
125
3.3V
R4
125
3.3V
3.3V
Zo = 50
+
_
LVPECL
Input
Zo = 50
R1
84
Figure 6A. 3.3V LVPECL Output Termination
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
R2
84
Figure 6B. 3.3V LVPECL Output Termination
24
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Termination for 2.5V LVPECL Outputs
level. The R3 in Figure 7B can be eliminated and the termination is
shown in Figure 7C.
Figure 7A and Figure 7B show examples of termination for 2.5V
LVPECL driver. These terminations are equivalent to terminating 50
to VCCO – 2V. For VCCO = 2.5V, the VCCO – 2V is very close to ground
2.5V
VCCO = 2.5V
2.5V
2.5V
VCCO = 2.5V
R1
250
R3
250
50
+
50
+
50
–
50
2.5V LVPECL Driver
–
R1
50
2.5V LVPECL Driver
R2
62.5
R2
50
R4
62.5
R3
18
Figure 7A. 2.5V LVPECL Driver Termination Example
Figure 7B. 2.5V LVPECL Driver Termination Example
2.5V
VCCO = 2.5V
50
+
50
–
2.5V LVPECL Driver
R1
50
R2
50
Figure 7C. 2.5V LVPECL Driver Termination Example
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
25
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
VFQFN EPAD Thermal Release Path
In order to maximize both the removal of heat from the package and
the electrical performance, a land pattern must be incorporated on
the Printed Circuit Board (PCB) within the footprint of the package
corresponding to the exposed metal pad or exposed heat slug on the
package, as shown in Figure 8. The solderable area on the PCB, as
defined by the solder mask, should be at least the same size/shape
as the exposed pad/slug area on the package to maximize the
thermal/electrical performance. Sufficient clearance should be
designed on the PCB between the outer edges of the land pattern
and the inner edges of pad pattern for the leads to avoid any shorts.
and dependent upon the package power dissipation as well as
electrical conductivity requirements. Thus, thermal and electrical
analysis and/or testing are recommended to determine the minimum
number needed. Maximum thermal and electrical performance is
achieved when an array of vias is incorporated in the land pattern. It
is recommended to use as many vias connected to ground as
possible. It is also recommended that the via diameter should be 12
to 13mils (0.30 to 0.33mm) with 1oz copper via barrel plating. This is
desirable to avoid any solder wicking inside the via during the
soldering process which may result in voids in solder between the
exposed pad/slug and the thermal land. Precautions should be taken
to eliminate any solder voids between the exposed heat slug and the
land pattern. Note: These recommendations are to be used as a
guideline only. For further information, please refer to the Application
Note on the Surface Mount Assembly of Amkor’s Thermally/
Electrically Enhance Leadframe Base Package, Amkor Technology.
While the land pattern on the PCB provides a means of heat transfer
and electrical grounding from the package to the board through a
solder joint, thermal vias are necessary to effectively conduct from
the surface of the PCB to the ground plane(s). The land pattern must
be connected to ground through these vias. The vias act as “heat
pipes”. The number of vias (i.e. “heat pipes”) are application specific
PIN
PIN PAD
SOLDER
EXPOSED HEAT SLUG
GROUND PLANE
THERMAL VIA
SOLDER
LAND PATTERN
(GROUND PAD)
PIN
PIN PAD
Figure 8. P.C. Assembly for Exposed Pad Thermal Release Path – Side View (drawing not to scale)
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
26
©2014 Integrated Device Technology, Inc.
IDT8T49N008I Data Sheet
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
Schematic Layout
Figure 9 (next page) shows an example of IDT8T49N008I application
schematic. The schematic focuses on functional connections and is
not configuration specific. Refer to the pin description and functional
tables in the datasheet to ensure that the logic control inputs are
properly set.
In order to achieve the best possible filtering, it is recommended that
the placement of the filter components be on the device side of the
PCB as close to the power pins as possible. If space is limited, the
0.1uF capacitor in each power pin filter should be placed on the
device side of the PCB and the other components can be placed on
the opposite side. Power supply filter recommendations are a general
guideline to be used for reducing external noise from coupling into
the devices.
In this example the device is operated at VCC = VCCO = VCCA = 3.3V
rather than 2.5V. The CLK, nCLK inputs are provided by a 3.3V
LVPECL driver and depicted with a Y-termination rather than the
standard four resistor VCC - 2V Thevinin termination for reasons of
minimum termination power and layout simplicity. Three examples of
PECL terminations are shown for the outputs to demonstrate mixing
of PECL termination design options.
The VCC and VCCO filters start to attenuate noise at approximately
10kHz. If a specific frequency noise component is known, such as
switching power supplies frequencies, it is recommended that
component values be adjusted and if required, additional filtering be
added. Additionally, good general design practices for power plane
voltage stability suggests adding bulk capacitance in the local area of
all devices.
As with any high speed analog circuitry, the power supply pins are
vulnerable to noise. To achieve optimum jitter performance, power
supply isolation is required. The IDT8T49N006I provides separate
power supplies to isolate from coupling into the internal PLL.
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
27
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
3.3V
U1
R1
4. 7K
17
20
16
39
AD D R _SE L
FS EL1
FS EL0
C LK_S EL
R2
4.7K
33
32
SC LK
SD A TA
11
R6
330
36
AD D R _SE L
FS E L1
FS E L0
C LK _SE L
LO C K
SD ATA
SC LK
Q0
nQ0
XTAL_I N
Q1
nQ1
12
25MH z(12pf )
XTAL_OU T
X1
C 18
9pF
Q2
nQ2
Q3
nQ3
C 23
9pF
Q4
nQ4
Zo = 50 Ohm
Q5
nQ5
R 3 50
14
C LK
15
Zo = 50 Ohm
nC LK
R 4 50
Q6
nQ6
Q7
nQ7
P EC L D riv er
LOC K
3. 3V
1
2
Q0_P
Q0_N
R7
133
R8
133
Z o = 50 Ohm
3
4
Q1_P
Q1_N
6
7
Q2_P
Q2_N
8
9
Q3_P
Q3_N
30
29
Q4_P
Q4_N
28
27
Q5_P
Q5_N
25
24
Q6_P
Q6_N
23
22
Q7_P
Q7_N
+
Z o = 50 Ohm
-
R9
82. 5
R 10
82.5
Optional Four Resistor
Thevinin Termination
R5
50
19
VC C
V C C _38 38
C 10
0. 1uF
VC C _19
C 15
0. 1uF
VC C A
35
VC C A
C7
0. 1uF
5
26
VC C O
C 17
0. 1uF
Z o = 50 Ohm
VC C
VC C O
VC C O
VE E
VE E
VE E
VE E
VE E
VE E
VE E
VE E
epad
+
10
13
18
21
31
34
37
40
Z o = 50 Ohm
-
R 13
50
R 14
50
41
R 15
50
C9
0. 1uF
3. 3V
F B1
1
2
B LM18BB 221SN 1
For AC termination options consult the IDT Applications Note
"Termination - 3.3V LVPECL"
V C C _19
C 14
C6
0. 1uF
10uF
Logic Control Input Examples
3. 3V
F B2
1
2
B LM18BB 221SN 1
VC C _38
Set Logic
Input to '1'
VCC
Set Logic
Input to '0'
VCC
C 16
C 19
0. 1uF
10uF
RU1
1K
RU 2
N ot I ns tal l
To Logic
Input
pins
R 16
VC C A
RD1
N ot Ins t all
10
To Logic
Input
pins
RD 2
1K
C8
10uF
3. 3V
1
FB 3
2
B LM18BB 221SN 1
C 22
0. 1uF
VC C O
C 21
10uF
Figure 9. IDT8T49N008I Application Schematic
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
28
©2014 Integrated Device Technology, Inc.
IDT8T49N008I Data Sheet
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
PCI Express Application Note
PCI Express jitter analysis methodology models the system
response to reference clock jitter. The block diagram below shows the
most frequently used Common Clock Architecture in which a copy of
the reference clock is provided to both ends of the PCI Express Link.
In the jitter analysis, the transmit (Tx) and receive (Rx) serdes PLLs
are modeled as well as the phase interpolator in the receiver. These
transfer functions are called H1, H2, and H3 respectively. The overall
system transfer function at the receiver is:
Ht  s  = H3  s    H1  s  – H2  s  
The jitter spectrum seen by the receiver is the result of applying this
system transfer function to the clock spectrum X(s) and is:
Y  s  = X  s   H3  s    H1  s  – H2  s  
In order to generate time domain jitter numbers, an inverse Fourier
Transform is performed on X(s)*H3(s) * [H1(s) - H2(s)].
PCIe Gen 2A Magnitude of Transfer Function
PCI Express Common Clock Architecture
For PCI Express Gen 1, one transfer function is defined and the
evaluation is performed over the entire spectrum: DC to Nyquist (e.g
for a 100MHz reference clock: 0Hz – 50MHz) and the jitter result is
reported in peak-peak.
PCIe Gen 2B Magnitude of Transfer Function
For PCI Express Gen 3, one transfer function is defined and the
evaluation is performed over the entire spectrum. The transfer
function parameters are different from Gen 1 and the jitter result is
reported in RMS.
PCIe Gen 1 Magnitude of Transfer Function
For PCI Express Gen 2, two transfer functions are defined with 2
evaluation ranges and the final jitter number is reported in RMS. The
two evaluation ranges for PCI Express Gen 2 are 10kHz – 1.5MHz
(Low Band) and 1.5MHz – Nyquist (High Band). The plots show the
individual transfer functions as well as the overall transfer function Ht.
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
PCIe Gen 3 Magnitude of Transfer Function
For a more thorough overview of PCI Express jitter analysis
methodology, please refer to IDT Application Note PCI Express
Reference Clock Requirements.
29
©2014 Integrated Device Technology, Inc.
IDT8T49N008I Data Sheet
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
LVPECL Power Considerations
This section provides information on power dissipation and junction temperature for the IDT8T49N008I.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the IDT8T49N008I is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for VCC = 3.465V, which gives worst case results.
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
•
Power (core)MAX = VCC_MAX * IEE_MAX = 3.465V * 225mA = 779.625mW
•
Power (outputs)MAX = 31.55mW/Loaded Output pair
If all outputs are loaded, the total power is 8 * 31.55mW = 252.4mW
Total Power_MAX (3.465V, with all outputs switching) = 779.625W + 252.4mW = 1032.025W
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad directly affects the reliability of the device. The
maximum recommended junction temperature is 125°C. Limiting the internal transistor junction temperature, Tj, to 125°C ensures that the bond
wire and bond pad temperature remains below 125°C.
The equation for Tj is as follows: Tj = JA * Pd_total + TA
Tj = Junction Temperature
JA = Junction-to-Ambient Thermal Resistance
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
TA = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance JA must be used. Assuming no air flow and
a multi-layer board, the appropriate value is 32.4°C/W per Table 7 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 1.032W * 32.4°C/W = 118.4°C. This is below the limit of 125°C.
This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow and the type of
board (multi-layer).
Table 7. Thermal Resistance JA for 40-Lead VFQFN, Forced Convection
JA by Velocity
Meters per Second
0
1
3
Multi-Layer PCB, JEDEC Standard Test Boards
32.4°C/W
25.7°C/W
23.4°C/W
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
30
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
3. Calculations and Equations.
The purpose of this section is to calculate the power dissipation for the LVPECL output pair.
LVPECL output driver circuit and termination are shown in Figure 10.
VCCO
Q1
VOUT
RL
50Ω
VCCO - 2V
Figure 10. LVPECL Driver Circuit and Termination
To calculate worst case power dissipation into the load, use the following equations which assume a 50 load, and a termination voltage of
VCC O – 2V.
•
For logic high, VOUT = VOH_MAX = VCCO_MAX – 0.75V
(VCCO_MAX – VOH_MAX) = 0.75V
•
For logic low, VOUT = VOL_MAX = VCCO_MAX – 1.6V
(VCCO_MAX – VOL_MAX) = 1.6V
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(VOH_MAX – (VCCO_MAX – 2V))/RL] * (VCCO_MAX – VOH_MAX) = [(2V – (VCCO_MAX – VOH_MAX))/RL] * (VCCO_MAX – VOH_MAX) =
[(2V – 0.75V)/50] * 0.75V = 18.75mW
Pd_L = [(VOL_MAX – (VCCO_MAX – 2V))/RL] * (VCCO_MAX – VOL_MAX) = [(2V – (VCCO_MAX – VOL_MAX))/RL] * (VCCO_MAX – VOL_MAX) =
[(2V – 1.6V)/50] * 1.6V = 12.80mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 31.55mW
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
31
©2014 Integrated Device Technology, Inc.
IDT8T49N008I Data Sheet
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
LVDS Power Considerations
This section provides information on power dissipation and junction temperature for the IDT8T49N008I.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the IDT8T49N008I is the sum of the core power plus the analog power plus the power dissipated in the load(s).
The following is the power dissipation for VCC = 3.3V +5% = 3.465V, which gives worst case results.
•
Power (core)MAX = VCC_MAX * (ICC_MAX + ICCA_MAX) = 3.465V * (125mA + 32mA) = 544.005mW
•
Power (outputs)MAX = VCCO_MAX * ICCO_MAX = 3.465V * 162mA = 561.33mW
Total Power_MAX = 544.005mW + 561.33mW = 1105.335mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad directly affects the reliability of the device. The
maximum recommended junction temperature is 125°C. Limiting the internal transistor junction temperature, Tj, to 125°C ensures that the bond
wire and bond pad temperature remains below 125°C.
The equation for Tj is as follows: Tj = JA * Pd_total + TA
Tj = Junction Temperature
JA = Junction-to-Ambient Thermal Resistance
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
TA = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance JA must be used. Assuming no air flow and
a multi-layer board, the appropriate value is 32.4°C/W per Table 8 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 1.105W * 32.4°C/W = 120.8°C. This is below the limit of 125°C.
This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow and the type of
board (multi-layer).
Table 8. Thermal Resistance JA for 40-Lead VFQFN, Forced Convection
JA by Velocity
Meters per Second
0
1
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
32.4°C/W
25.7°C/W
23.4°C/W
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
32
©2014 Integrated Device Technology, Inc.
IDT8T49N008I Data Sheet
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
Reliability Information
Table 9. JA vs. Air Flow Table for a 40-Lead VFQFN
JA vs. Air Flow
Meters per Second
Multi-Layer PCB, JEDEC Standard Test Boards
0
1
2.5
32.4°C/W
25.7°C/W
23.4°C/W
Transistor Count
The transistor count for IDT8T49N008I is: 26,856
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
33
©2014 Integrated Device Technology, Inc.
IDT8T49N008I Data Sheet
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
40-Lead VFQFN Package Outline and Package Dimensions
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
34
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
40-Lead VFQFN Package Outline and Package Dimensions, continued
40-Lead VFQFN, D2/E2 EPAD Dimensions: 4.65mm x 4.65mm
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
35
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Ordering Information
Table 10. Ordering Information
Part/Order Number
Marking
Package
Shipping Packaging
Temperature
8T49N008A-dddNLGI
IDT8T49N008A-dddNLGI
“Lead-Free” 40-Lead VFQFN
Tray
-40C to 85C
8T49N008A-dddNLGI8
IDT8T49N008A-dddNLGI
“Lead-Free” 40-Lead VFQFN
Tape & Reel
-40C to 85C
®
NOTE: For the specific -ddd order codes, refer to the Programmable FemtoClock NG Product Ordering Guide document.
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
36
©2014 Integrated Device Technology, Inc.
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
IDT8T49N008I Data Sheet
Revision History Sheet
Rev
Table
A
A
T10
Page
Pin Assignment - repositioned pin numbers (11-20).
4/18/12
36
Changed footer part/order number from IDT8T49N008BNLGI to IDT8T49N008ANLGI.
Ordering Information Table - changed Shipping Packaging from 1000 Tape & Reel to
5000 Tape & Reel.
4/23/12
Changed name of the IDT8T49N00xI Programmable FemtoClock® NG Product Ordering
Information document to Programmable FemtoClock® Ordering Product Information
Deleted quantity from Tape & Reel, Deleted Lead Free note.
8/21/13
Changed title to Programmable FemtoClock® NG LVPECL/LVDS Clock Generator with
8-Outputs.
Changed text from ‘Programmable FemtoClock® Ordering Product Information’ to
‘Programmable FemtoClock® NG Product Ordering Guide’.
Changed Note from ‘Programmable FemtoClock® Ordering Product Information’ to
‘Programmable FemtoClock® NG Product Ordering Guide’.
9/26/13
Changed the min load capacitance from 12pF to 10pF
10/15/13
Corrected part number in the footer pages from IDT8T49N00BNLGI to
IDT8T49N00ANLGI
2/13/14
11, 38
38
1
11
A
A
A
Date
1
A
T10
Description of Change
T10
38
T5
14
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
37
©2014 Integrated Device Technology, Inc.
IDT8T49N008I Data Sheet
PROGRAMMABLE FEMTOCLOCK® NG LVPECL/LVDS CLOCK GENERATOR WITH 8-OUTPUTS
We’ve Got Your Timing Solution
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San Jose, California 95138
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800-345-7015 (inside USA)
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Fax: 408-284-2775
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Technical Support Sales
netcom@idt.com
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